#include <stdio.h>
#include "md5.h"
#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21
#define R_memset(x, y, z) memset(x, y, z)
#define R_memcpy(x, y, z) memcpy(x, y, z)
#define R_memcmp(x, y, z) memcmp(x, y, z)

static void MD5Transform(UINT4[4], unsigned char[64]);
static void Encode(unsigned char *, UINT4 *, unsigned int);
static void Decode(UINT4 *, unsigned char *, unsigned int);
static unsigned char PADDING[64] = {
	0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
#define FF(a, b, c, d, x, s, ac){\
	(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac);\
	(a) = ROTATE_LEFT ((a), (s));\
	(a) += (b);\
}
#define GG(a, b, c, d, x, s, ac) {\
	(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac);\
	(a) = ROTATE_LEFT ((a), (s));\
	(a) += (b);\
}
#define HH(a, b, c, d, x, s, ac) {\
	(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac);\
	(a) = ROTATE_LEFT ((a), (s));\
	(a) += (b);\
}
#define II(a, b, c, d, x, s, ac) {\
	(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac);\
	(a) = ROTATE_LEFT ((a), (s));\
	(a) += (b);\
}
/* MD5 initialization. Begins an MD5 operation, writing a new context. */
void MD5Init (MD5_CTX *context)
{
	context->count[0] = context->count[1] = 0;
	/* Load magic initialization constants.*/
	context->state[0] = 0x67452301;
	context->state[1] = 0xefcdab89;
	context->state[2] = 0x98badcfe;
	context->state[3] = 0x10325476;
}
void MD5Update(MD5_CTX *context,unsigned char * input,unsigned int inputLen)
{
	unsigned int i, index, partLen;
	index = (unsigned int)((context->count[0] >> 3) & 0x3F);
	if((context->count[0] += ((UINT4)inputLen << 3)) < ((UINT4)inputLen << 3))
		context->count[1]++;
	context->count[1] += ((UINT4)inputLen >> 29);
	partLen = 64 - index;
	if(inputLen >= partLen)
	{      
		R_memcpy((POINTER)&context->buffer[index], (POINTER)input, partLen);     
		MD5Transform(context->state, context->buffer);      
		for(i = partLen; i + 63 < inputLen; i += 64)         
			MD5Transform(context->state, &input[i]);      
		index = 0;    
	}    
	else      
		i = 0;
	R_memcpy((POINTER)&context->buffer[index],(POINTER)&input[i], inputLen-i);
}
void MD5Final (unsigned char digest[16],MD5_CTX *context)
{
	unsigned char bits[8];
	unsigned int index, padLen;
	Encode(bits, context->count, 8);
	index = (unsigned int)((context->count[0] >> 3) & 0x3f);
	padLen = (index < 56) ? (56 - index) : (120 - index);
	MD5Update(context, PADDING, padLen);
	MD5Update(context, bits, 8);Encode(digest, context->state, 16);
	R_memset((POINTER)context, 0, sizeof(*context));
}
static void MD5Transform (UINT4 state[4], unsigned char block[64])
{
	UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
	Decode(x, block, 64);
	/* Round 1 */
	FF(a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
	FF(d, a, b, c, x[ 1], S12, 0xe8c7b756); 
	FF(c, d, a, b, x[ 2], S13, 0x242070db); 
	FF(b, c, d, a, x[ 3], S14, 0xc1bdceee); 
	FF(a, b, c, d, x[ 4], S11, 0xf57c0faf); 
	FF(d, a, b, c, x[ 5], S12, 0x4787c62a); 
	FF(c, d, a, b, x[ 6], S13, 0xa8304613);
	FF(b, c, d, a, x[ 7], S14, 0xfd469501); 
	FF(a, b, c, d, x[ 8], S11, 0x698098d8); 
	FF(d, a, b, c, x[ 9], S12, 0x8b44f7af);
	FF(c, d, a, b, x[10], S13, 0xffff5bb1);
	FF(b, c, d, a, x[11], S14, 0x895cd7be);
	FF(a, b, c, d, x[12], S11, 0x6b901122);
	FF(d, a, b, c, x[13], S12, 0xfd987193);
	FF(c, d, a, b, x[14], S13, 0xa679438e);
	FF(b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
	/* Round 2 */
	GG(a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
	GG(d, a, b, c, x[ 6], S22, 0xc040b340);
	GG(c, d, a, b, x[11], S23, 0x265e5a51);
	GG(b, c, d, a, x[ 0], S24, 0xe9b6c7aa);
	GG(a, b, c, d, x[ 5], S21, 0xd62f105d);
	GG(d, a, b, c, x[10], S22, 0x2441453);
	GG(c, d, a, b, x[15], S23, 0xd8a1e681);
	GG(b, c, d, a, x[ 4], S24, 0xe7d3fbc8);
	GG(a, b, c, d, x[ 9], S21, 0x21e1cde6);
	GG(d, a, b, c, x[14], S22, 0xc33707d6);
	GG(c, d, a, b, x[ 3], S23, 0xf4d50d87);
	GG(b, c, d, a, x[ 8], S24, 0x455a14ed);
	GG(a, b, c, d, x[13], S21, 0xa9e3e905);
	GG(d, a, b, c, x[ 2], S22, 0xfcefa3f8);
	GG(c, d, a, b, x[ 7], S23, 0x676f02d9);
	GG(b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
	/* Round 3 */
	HH(a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
	HH(d, a, b, c, x[ 8], S32, 0x8771f681);
	HH(c, d, a, b, x[11], S33, 0x6d9d6122);
	HH(b, c, d, a, x[14], S34, 0xfde5380c);
	HH(a, b, c, d, x[ 1], S31, 0xa4beea44);
	HH(d, a, b, c, x[ 4], S32, 0x4bdecfa9);
	HH(c, d, a, b, x[ 7], S33, 0xf6bb4b60);
	HH(b, c, d, a, x[10], S34, 0xbebfbc70);
	HH(a, b, c, d, x[13], S31, 0x289b7ec6);
	HH(d, a, b, c, x[ 0], S32, 0xeaa127fa);
	HH(c, d, a, b, x[ 3], S33, 0xd4ef3085);
	HH(b, c, d, a, x[ 6], S34, 0x4881d05);
	HH(a, b, c, d, x[ 9], S31, 0xd9d4d039);
	HH(d, a, b, c, x[12], S32, 0xe6db99e5);
	HH(c, d, a, b, x[15], S33, 0x1fa27cf8);
	HH(b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
	/* Round 4 */
	II(a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
	II(d, a, b, c, x[ 7], S42, 0x432aff97);
	II(c, d, a, b, x[14], S43, 0xab9423a7);
	II(b, c, d, a, x[ 5], S44, 0xfc93a039);
	II(a, b, c, d, x[12], S41, 0x655b59c3);
	II(d, a, b, c, x[ 3], S42, 0x8f0ccc92);
	II(c, d, a, b, x[10], S43, 0xffeff47d);
	II(b, c, d, a, x[ 1], S44, 0x85845dd1);
	II(a, b, c, d, x[ 8], S41, 0x6fa87e4f);
	II(d, a, b, c, x[15], S42, 0xfe2ce6e0);
	II(c, d, a, b, x[ 6], S43, 0xa3014314);
	II(b, c, d, a, x[13], S44, 0x4e0811a1);
	II(a, b, c, d, x[ 4], S41, 0xf7537e82);
	II(d, a, b, c, x[11], S42, 0xbd3af235);
	II(c, d, a, b, x[ 2], S43, 0x2ad7d2bb);
	II(b, c, d, a, x[ 9], S44, 0xeb86d391);/* 64 */
	state[0] += a;
	state[1] += b;
	state[2] += c;
	state[3] += d;
	R_memset((POINTER)x, 0, sizeof(x));
}
static void Encode(unsigned char *output, UINT4 *input,unsigned int len)
{
	unsigned int i, j;
	for(i = 0, j = 0; j < len; i++, j += 4) 
	{
		output[j] = (unsigned char)(input[i] & 0xff);
		output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
		output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
		output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
	}
}
static void Decode(UINT4 *output, unsigned char *input,unsigned int len)
{
	unsigned int i, j;
	for(i = 0, j = 0; j < len; i++, j += 4)
		output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |   (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
}

void md5_encode(unsigned char* decrypt,unsigned char* encrypt,unsigned int len)
{
	MD5_CTX md5;
	MD5Init(&md5);
	MD5Update(&md5,encrypt,len);
	MD5Final(decrypt,&md5);
}
